一种针对大像元CCD的电荷累积方法研究

Method for Charge Accumulation in Large-Pixel CCD

提出了一种针对大像元CCD的电荷累积的方法,包括器件内垂直和水平方向像元结构细分与电荷包求和,以及驱动时序上的多相非等分驱动。其特点在于,通过时序与CCD图传感器结构的配合,实现了大电荷量在图像传感器内累积的功能,大幅提高了模拟信号动态。再将此方法应用到一款210μm×210μm的大像元CCD器件上,以此方法为架构搭建硬件电路并进行软件设计,通过采集成像和参数测试对方法效果进行验证。测试结果表明,在不损失转移效率的情况下,实现了CCD内信号累积和模拟输出的CDS采集成像,提高了满阱容量和动态范围。

This article proposes a method for charge accumulation in a large-pixel CCD,which includes two aspects:The first is the subdivision of vertical and horizontal pixel structures within the device and the sum of charge packets.The second is the multiphase nonuniform driving in driving timing.This method is applied to a 210μm×210μm pixel CCD and is used to build hardware circuits and design software.Its effectiveness is verified via acquisition imaging and parameter testing.Results show that a large full-well capacity and dynamic range are achieved without compromising transfer efficiency.